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Old 12-07-2009, 09:21 PM
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Join Date: May 2007
Location: The Ghetto of Walnut Creek
Posts: 90
95 E300D Soot in Rear. Catalytic converter? Oxidation Catalyst?

For the past six months or so, my car has been the recipient of soot build up. If I clean it, it will come back in a matter of days. It's only on the rear face of my car, nowhere else. I've also had this nagging, drawn out fuel economy problem that may or may not be linked. My friend told me that he could see (looking at the cat, not the trunk) that I needed a new catalytic converter. From reading other threads, apparently catalytic converters can get clogged and cause performance problems, hence my linking of the two problems. I've also read, however, that the diesels don't have a cat, but rather, an oxidation catalyst. Do they look the same? I only ask because my friend is pretty well versed in auto mechanics, and identified whatever it is behind the tailpipe as a catalytic converter. Some users said that some Mercedes diesels have oxidation catalysts, yet Wikipedia redirects "diesel oxidation catalyst" to "diesel particulate filter," which, if the article I read is correct, was not installed in diesel MB's until '03. Soooo, does anyone know if my car has/should have a cat? Could that be the source of my plight? Thanks in advance!

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Old 12-07-2009, 10:03 PM
compu_85's Avatar
Waiting for his Model 3..
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
Your car has an 1 way ox cat. Just like every other 2006 and earlier catalyst equipped diesel. If you choose to replace it getting a generic cat meant for diesels will work.

1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
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Old 12-07-2009, 11:26 PM
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Join Date: Feb 2004
Location: Walnut Creek, CA & 1,150 miles S of Key West
Posts: 4,874
On my turbo, its within the first 30" after exiting the exhaust manifold; coffee can sized. Pretty easy to tell if it is rattling with the hood up and your thumb on the throttle potensioner.
Terry Allison
N. Calif. & S. of Key West

09' E320 Bluetec 77k
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Old 12-08-2009, 04:30 PM
michakaveli's Avatar
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Join Date: Nov 2002
Location: Columbia, SC
Posts: 1,721
I'm in the same boat.... I thinking of running a straight pipe or resonator of sorts to fill the void.....

'97 E300
'99 E300
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